Cross pollination with your squash is unlikely to be a problem. If they do cross, you would still get fruit, just don't plant the seeds. More likely they won't cross.

Cantaloupe are like most squashes in that they start out with male blossoms and these set fruit about as often as you see pregnant football players. When the plants get a bit older, they will start producing female flowers also and these will set fruit. It is easy to tell what kind of flowers you have--male flowers will have a short stem going from the flower to the vine. Female flowers will have the same short stem, then a bulge which is the future melon, then the blossom.